Digital measuring method of frequency and phase
Title：
Digital measuring method of frequency and phase
Application Number：
 02116885
Application Date：
 2002/04/24
Announcement Date：
 2002/12/04
Pub. Date：
Publication Number：
 1382995
Announcement Number：
 1159592
Grant Date：
 2004-7-28
Granted Pub. Date：
 2004-7-28
ApplicationType：
 Invention
State/Country：
 11[China|beijing]
IPC：
 G01R 23/02, G01R 25/00
Applicant(s)：
 Tsinghua Univ
Inventor(s)：
 Pang Hao, Zu Yunxiao, Li Dongxia
Key Words：
 Digital measuring method, frequency, phase
Abstract：
 The invention relates to the method for measuring frequencies and phases digitally belonging to the technique area for measuring the circuit parameters. Two signals with 90 degrees of the phase difference are obtained by sampling the AC input signal with the help of two sets of pre-processes. Based on the values of the signals, the locked phase data is calculated out. Further, based on the phase locking structure, the measure of the frequency and phase are realized. Taking full advantage of the phase information contained in the signal waveform, the locked phase data can be updated at the sampling speed. Moreover it provides the advantages of increasing the accuracy of discriminating phases, and the speed of tracking the locked phase and reducing the measuring time. When the phase locking is stabilized, the phase can approach the locked phase with zero mean deviation so as to prevent noise interference.
Claim：
Priority：
PCT：
LegalStatus：

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2008-4-17
  Selected patents owned by Tsinghua University filed in 2005 are loaded.
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